Non-adiabatic pulsations in ESTER models

Abstract

One of the greatest challenges in interpreting the pulsations of rapidly rotating stars is mode identification, i.e. correctly matching theoretical modes to observed pulsation frequencies. Indeed, the latest observations as well as current theoretical results show the complexity of pulsation spectra in such stars, and the lack of easily recognisable patterns. In the present contribution, the latest results on non-adiabatic effects in such pulsations are described, and we show how these come into play when identifying modes. These calculations fully take into account the effects of rapid rotation, including centrifugal distortion, and are based on models from the ESTER project, currently the only rapidly rotating models in which the energy conservation equation is satisfied, a prerequisite for calculating non-adiabatic effects. Non-adiabatic effects determine which modes are excited and play a key role in the near-surface pulsation-induced temperature variations which intervene in multi-colour amplitude ratios and phase differences, as well as line profile variations.

Proceedings for the Joint TASC2 & KASC9 Workshop, Terceira, Azores, 2016

References in corpus (6)

• The interior rotation of a sample of gamma Doradus stars from ensemble modelling of their gravity mode period spacings
• Acoustic oscillations of rapidly rotating polytropic stars. II. Effects of the Coriolis and centrifugal accelerations
• Regular patterns in the acoustic spectrum of rapidly rotating stars
• On the Structure and Properties of Differentially Rotating Main-Sequence Stars in the 1-2 M_sun Range
• A new method for the spectroscopic identification of stellar non-radial pulsation modes. II. Mode identification of the Delta Scuti star FG Virginis
• Pulsations of rapidly rotating stars: II. Realistic modelling for intermediate-mass stars